@@ -116,21 +116,21 @@
 	   programName: (OFString *)programName
 	     arguments: (nullable OFArray OF_GENERIC(OFString *) *)arguments
 	   environment: (nullable OFDictionary
 			    OF_GENERIC(OFString *, OFString *) *)environment;
 
-- init OF_UNAVAILABLE;
+- (instancetype)init OF_UNAVAILABLE;
 
 /*!
  * @brief Initializes an already allocated OFProcess with the specified program
  *	  and invokes the program.
  *
  * @param program The program to execute. If it does not start with a slash, the
  *		  search path specified in PATH is used.
  * @return An initialized OFProcess.
  */
-- initWithProgram: (OFString *)program;
+- (instancetype)initWithProgram: (OFString *)program;
 
 /*!
  * @brief Initializes an already allocated OFProcess with the specified program
  *	  and arguments and invokes the program.
  *
@@ -137,12 +137,13 @@
  * @param program The program to execute. If it does not start with a slash, the
  *		  search path specified in PATH is used.
  * @param arguments The arguments to pass to the program, or `nil`
  * @return An initialized OFProcess.
  */
-- initWithProgram: (OFString *)program
-	arguments: (nullable OFArray OF_GENERIC(OFString *) *)arguments;
+- (instancetype)
+    initWithProgram: (OFString *)program
+	  arguments: (nullable OFArray OF_GENERIC(OFString *) *)arguments;
 
 /*!
  * @brief Initializes an already allocated OFProcess with the specified program,
  *	  program name and arguments and invokes the program.
  *
@@ -151,13 +152,14 @@
  * @param programName The program name for the program to invoke (argv[0]).
  *		      Usually, this is equal to program.
  * @param arguments The arguments to pass to the program, or `nil`
  * @return An initialized OFProcess.
  */
-- initWithProgram: (OFString *)program
-      programName: (OFString *)programName
-	arguments: (nullable OFArray OF_GENERIC(OFString *) *)arguments;
+- (instancetype)
+    initWithProgram: (OFString *)program
+	programName: (OFString *)programName
+	  arguments: (nullable OFArray OF_GENERIC(OFString *) *)arguments;
 
 /*!
  * @brief Initializes an already allocated OFProcess with the specified program,
  *	  program name, arguments and environment and invokes the program.
  *
@@ -171,15 +173,16 @@
  *		      override the environment. If you want to add to the
  *		      existing environment, you need to get the existing
  *		      environment first, copy it, modify it and then pass it.
  * @return An initialized OFProcess.
  */
-- initWithProgram: (OFString *)program
-      programName: (OFString *)programName
-	arguments: (nullable OFArray OF_GENERIC(OFString *) *)arguments
-      environment: (nullable OFDictionary
-		       OF_GENERIC(OFString *, OFString *) *)environment
+- (instancetype)
+    initWithProgram: (OFString *)program
+	programName: (OFString *)programName
+	  arguments: (nullable OFArray OF_GENERIC(OFString *) *)arguments
+	environment: (nullable OFDictionary
+			 OF_GENERIC(OFString *, OFString *) *)environment
     OF_DESIGNATED_INITIALIZER;
 
 /*!
  * @brief Closes the write direction of the process.
  *